Subset a dataframe based on plotly click event - r

Question

I have the data frame below:
Name<-c("John","Bob","Jack")
Number<-c(3,3,5)
NN<-data.frame(Name,Number)
And a simple shiny app which creates a plotly histogram out of it. My goal is to click on a bar of the histogram and display the Name in a datatable that correspond to this bar. For example if I click on the first bar which is 3 I will take a table with John and Bob names.
library(plotly)
library(shiny)
library(DT)
ui <- fluidPage(
mainPanel(
plotlyOutput("heat")
),
DT::dataTableOutput('tbl4')
)
server <- function(input, output, session) {
output$heat <- renderPlotly({
p <- plot_ly(x = NN$Number, type = "histogram")
})
output$tbl4 <- renderDataTable({
s <- event_data("plotly_click")
if (length(s) == 0) {
"Click on a bar in the histogram to see its values"
} else {
NN[ which(NN$Number==as.numeric(s[2])), 1]
}
})
}
shinyApp(ui, server)

Answer 1

I am adding the solution by modifying your data.frame as mentioned in the comment:
library(plotly)
library(shiny)
library(DT)
ui <- fluidPage(
mainPanel(
plotlyOutput("heat")
),
DT::dataTableOutput('tbl4')
)
server <- function(input, output, session) {
output$heat <- renderPlotly({
Name<-c("John","Bob","Jack")
Number<-c(3,3,5)
Count<-c(2,2,1)
NN<-data.frame(Name,Number,Count)
render_value(NN) # You need function otherwise data.frame NN is not visible
p <- plot_ly(x = NN$Number, type = "histogram",source="subset") # set source so
# that you can get values from source using click_event
})
render_value=function(NN){
output$tbl4 <- renderDataTable({
s <- event_data("plotly_click",source = "subset")
print(s)
return(DT::datatable(NN[NN$Count==s$y,]))
})
}
}
shinyApp(ui, server)
Screenshot from solution: